It isn't that simple, many lost languages have only been restored because of the dual language books. Similarly, I think what matters here is the higher-order

It isn't that simple, many lost languages have only been restored because of the dual language books. Similarly, I think what matters here is the higher-order redundancy. A single encoding that can be lost, is not straightforward to figure out, and holds the clue to a massive storage, isn't the most future proof decision; it's a single point of failure.